A time-resolved fluorescence study of dissolved organic matter in a riverine to marine transition zone

Clark, Catherine D.; Jimenez-Morais, Jennifer; Jones, Guilford; Zanardi-Lamardo, Eliete; Moore, Cynthia A.; Zika, Rod G.

doi:10.1016/s0304-4203(02)00014-2

Cited by 73 publications

(47 citation statements)

References 32 publications

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“…F max /TOC was higher for TTI and WWB than for FB, suggesting that the DOM in TTI and WWB is of more terrestrial origin. These values were comparable to those of other studies in the FCE (Clark et al, 2002;Jaffe´et al, 2004). In the FCE estuaries, correlations between F max and TOC were observed for FB and TTI (r 2 =0.323, p<0.0001, n=594 for FB; r 2 =0.432, p<0.0001, n=781 for TTI), suggesting one of the reasons for the variability in F max can be explained by the variation of TOC for FB and TTI.…”

Section: Regional Dom Variabilitysupporting

confidence: 88%

“…The maximum emission wavelength (k max ), the emission wavelength which provides F max , and fluorescence index (FI) have been used to assess the sources of CDOM in the FCE estuaries (Jaffeé t al., 2004;Clark et al, 2002). Terrestrial, higher plant-derived DOM typically has lower FI values and longer k max than marine (microbial and seagrass community) derived DOM (Donard et al, 1989;Battin, 1998;McKnight et al, 2001; unpublished data of authors).…”

Section: Qualitative Parametersmentioning

confidence: 99%

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Spatial, geomorphological, and seasonal variability of CDOM in estuaries of the Florida Coastal Everglades

et al. 2006

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This paper demonstrates the usefulness of fluorescence techniques for long-term monitoring and assessment of the dynamics (sources, transport and fate) of chromophoric dissolved organic matter (CDOM) in highly compartmentalized estuarine regions with non-point water sources. Water samples were collected monthly from a total of 73 sampling stations in the Florida Coastal Everglades (FCE) estuaries during 2001 and 2002. Spatial and seasonal variability of CDOM characteristics were investigated for geomorphologically distinct sub-regions within Florida Bay (FB), the Ten Thousand Islands (TTI), and Whitewater Bay (WWB). These variations were observed in both quantity and quality of CDOM. TOC concentrations in the FCE estuaries were generally higher during the wet season (June-October), reflecting high freshwater loadings from the Everglades in TTI, and a high primary productivity of marine biomass in FB. Fluorescence parameters suggested that the CDOM in FB is mainly of marine/microbial origin, while for TTI and WWB a terrestrial origin from Everglades marsh plants and mangroves was evident. Variations in CDOM quality seemed mainly controlled by tidal exchange/mixing of Everglades freshwater with Florida Shelf waters, tidally controlled releases of CDOM from fringe mangroves, primary productivity of marine vegetation in FB and diagenetic processes such as photodegradation (particularly for WWB). The source and dynamics of CDOM in these subtropical estuaries is complex and found to be influenced by many factors including hydrology, geomorphology, vegetation cover, landuse and biogeochemical processes. Simple, easy to measure, high sample throughput fluorescence parameters for surface waters can add valuable information on CDOM dynamics to long-term water quality studies which can not be obtained from quantitative determinations alone.

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Section: Regional Dom Variabilitysupporting

confidence: 88%

Section: Qualitative Parametersmentioning

confidence: 99%

Spatial, geomorphological, and seasonal variability of CDOM in estuaries of the Florida Coastal Everglades

et al. 2006

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“…The concentrations of DOC correlated significantly with salinities (r 2 = 0.59-0.92, p < 0.0001), indicating that DOC behaves conservatively in the mixing zone of this estuary (Fig. 2a), which is commonly observed in estuarine mixing zones (Laane, 1980;Mantoura and Woodward, 1983;Del Castillo et al, 2000;Clark et al, 2002;Jaffé et al, 2004).…”

Section: Behaviors and Sources Of Doc In The Estuarine Mixing Zonementioning

confidence: 73%

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Lee¹,

Kim²

2018

Biogeosciences

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Abstract. We monitored seasonal variations in dissolved organic carbon (DOC), the stable carbon isotope of DOC (δ 13 C-DOC), and fluorescent dissolved organic matter (FDOM) in water samples from a fixed station in the Nakdong River Estuary, Korea. Sampling was performed every hour during spring tide once a month from October 2014 to August 2015. The concentrations of DOC and humic-like FDOM showed significant negative correlations against salinity (r 2 = 0.42-0.98, p < 0.0001), indicating that the river-originated DOM components were the major source and behave conservatively in the estuarine mixing zone. The extrapolated δ 13 C-DOC values (−27.5 to −24.5 ‰) in fresh water confirm that both components are mainly of terrestrial origin. The slopes of humic-like FDOM against salinity were 60-80 % higher in the summer and fall due to higher terrestrial production of humic-like FDOM. The slopes of proteinlike FDOM against salinity, however, were 70-80 % higher in spring due to higher biological production in river water. Our results suggest that there are large seasonal changes in riverine fluxes of humic-and protein-like FDOM to the ocean.

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“…Clark et al (2002) and Murphy et al (2008) showed that peak C3 is a humic fraction of CDOM present in fresh water and deep seawaters derived from terrestrial sources (henceforth identified as Terrestrial Humic-like). The C4 peak corresponds to a humic fluorophore freshly produced in the marine environment by microbial metabolism (Parlanti et al 2000; henceforth identified as Marine Humic-like).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Effects of recirculation of seawater enriched in inorganic nitrogen on dissolved organic carbon processing in sandy seepage face sediments

Ibánhez

Rocha

2014

Marine Chemistry

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Please cite this article as: Ibánhez, J. Severino P., Rocha, Carlos, Effects of recirculation of seawater enriched in inorganic nitrogen on dissolved organic carbon processing in sandy seepage face sediments, Marine Chemistry (2014Chemistry ( ), doi: 10.1016Chemistry ( /j.marchem.2014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. suggest that the availability of DIN in permeable seepage faces increases the net production of labile DOC, by enhancing the ability of the benthic microbial community to process refractory organic matter. Hence, we suggest that increasing DIN availability in coastal permeable sediments accelerates benthic organic C processing, promoting the release of more labile DOC to receiving water bodies.

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A time-resolved fluorescence study of dissolved organic matter in a riverine to marine transition zone

Cited by 73 publications

References 32 publications

Spatial, geomorphological, and seasonal variability of CDOM in estuaries of the Florida Coastal Everglades

Spatial, geomorphological, and seasonal variability of CDOM in estuaries of the Florida Coastal Everglades

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Effects of recirculation of seawater enriched in inorganic nitrogen on dissolved organic carbon processing in sandy seepage face sediments

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